摘要
本文针对WCDMA系统非连续导频情况,研究了采用Turbo编码的迭代信道估计技术,提出了一种基于LMS算法自适应滤波的信道估计方法。对信道估计值采用不同滤波器方法:维纳滤波、滑动平均滤波、FIR滤波、LMS自适应滤波的性能进行了比较,同时采用基于代价函数的方法对迭代信道估计进行了分析。理论分析和仿真结果表明对迭代信道估计所得信道估计值进行滤波的方法能够提高信道估计的精度,从而降低接收机的误比特率。
In WCDMA standard, the pilot channel is time-multiplexed with power control bits and is not continuous. Iterative channel estimation for WCDMA system with turbo coding and comparison between different filter algorithms for estimated channel parameter such as wiener fitter, moving average filter, FIR filter, LMS adaptive filter are studied in this paper. A cost function is also used to analyze the algorithm of iterative channel estimation. Theoretical and simulation results illustrate that the proposed LMS filter for joint channel estimation can improve the performance of channel estimation in WCDMA system.
出处
《电路与系统学报》
CSCD
北大核心
2009年第3期45-51,共7页
Journal of Circuits and Systems
基金
国家863资助课题(2007AA01Z268
2007AA01Z259)
